18431011 has 2 divisors, whose sum is σ = 18431012. Its totient is φ = 18431010.

The previous prime is 18430943. The next prime is 18431041. The reversal of 18431011 is 11013481.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18431011 - 2⁷ = 18430883 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18431011.

It is not a weakly prime, because it can be changed into another prime (18431041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9215505 + 9215506.

It is an arithmetic number, because the mean of its divisors is an integer number (9215506).

Almost surely, 2^18431011 is an apocalyptic number.

18431011 is a deficient number, since it is larger than the sum of its proper divisors (1).

18431011 is an equidigital number, since it uses as much as digits as its factorization.

18431011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 18431011 is about 4293.1353344613. The cubic root of 18431011 is about 264.1494552813.

Adding to 18431011 its reverse (11013481), we get a palindrome (29444492).

The spelling of 18431011 in words is "eighteen million, four hundred thirty-one thousand, eleven".